Remove capitalist links

Author: robbievanleeuwen

README.md

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 ![alt text](logo.png "sectionproperties")
 
-[![ko-fi](https://www.ko-fi.com/img/githubbutton_sm.svg)](https://ko-fi.com/F1F32ZRPZ)
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 [![Build Status](https://travis-ci.com/robbievanleeuwen/section-properties.svg?branch=master)](https://travis-ci.com/robbievanleeuwen/section-properties) [![Documentation Status](https://readthedocs.org/projects/sectionproperties/badge/?version=latest)](https://sectionproperties.readthedocs.io/en/latest/?badge=latest)
 
 A python package for the analysis of arbitrary cross-sections using the finite element method written by Robbie van Leeuwen. *sectionproperties* can be used to determine section properties to be used in structural design and visualise cross-sectional stresses resulting from combinations of applied forces and bending moments.